Microscopic phase separation in triangular-lattice quantum spin magnetκ-(BEDT-TTF) 2Cu 2(CN) 3 probed by muon spin relaxation

Saor Nakajima; Taka Suzuki; Yasuyuk Ishii; Kazuk Ohishi; Isa Watanabe; Takayuk Goto; Akir Oosawa; Naok Yoneyama; Nori Kobayashi; Francis L. Pratt; Takahik Sasaki

doi:10.1143/JPSJ.81.063706

Microscopic phase separation in triangular-lattice quantum spin magnetκ-(BEDT-TTF) ₂Cu ₂(CN) ₃ probed by muon spin relaxation

Saor Nakajima, Taka Suzuki, Yasuyuk Ishii, Kazuk Ohishi, Isa Watanabe, Takayuk Goto, Akir Oosawa, Naok Yoneyama, Nori Kobayashi, Francis L. Pratt, Takahik Sasaki

Institute for Materials Research (IMR)

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

Abstract

The ground state of the quantum spin system κ-(BEDT-TTF) ₂Cu ₂(CN) ₃, in which antiferromagnetically interacting S = 1=2 spins are located on a nearly equilateral triangular lattice, attracts considerable interest from both experimental and theoretical aspects, because a simple antiferromagnetic order may be inhibited owing to geometrical frustration, and hence, an exotic ground state is expected. Furthermore, two recent reports on the ground state of this system have increased the intrigue by showing completely controversial results: one indicates the gapless state and the other the gapped state. By utilizing the SR microscopic probe, we have investigated its spin dynamics below 0.1 K, unveiling its microscopically phase-separated ground state at zero field.

Original language	English
Article number	063706
Journal	journal of the physical society of japan
Volume	81
Issue number	6
DOIs	https://doi.org/10.1143/JPSJ.81.063706
Publication status	Published - 2012 Jun

Keywords

Frustration
Organic superconductors
Quantum spin antiferromagnet
Triangular lattice
μSR

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.81.063706

Cite this

Nakajima, S., Suzuki, T., Ishii, Y., Ohishi, K., Watanabe, I., Goto, T., Oosawa, A., Yoneyama, N., Kobayashi, N., Pratt, F. L., & Sasaki, T. (2012). Microscopic phase separation in triangular-lattice quantum spin magnetκ-(BEDT-TTF) ₂Cu ₂(CN) ₃ probed by muon spin relaxation. journal of the physical society of japan, 81(6), [063706]. https://doi.org/10.1143/JPSJ.81.063706

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title = "Microscopic phase separation in triangular-lattice quantum spin magnetκ-(BEDT-TTF) 2Cu 2(CN) 3 probed by muon spin relaxation",

abstract = "The ground state of the quantum spin system κ-(BEDT-TTF) 2Cu 2(CN) 3, in which antiferromagnetically interacting S = 1=2 spins are located on a nearly equilateral triangular lattice, attracts considerable interest from both experimental and theoretical aspects, because a simple antiferromagnetic order may be inhibited owing to geometrical frustration, and hence, an exotic ground state is expected. Furthermore, two recent reports on the ground state of this system have increased the intrigue by showing completely controversial results: one indicates the gapless state and the other the gapped state. By utilizing the SR microscopic probe, we have investigated its spin dynamics below 0.1 K, unveiling its microscopically phase-separated ground state at zero field.",

keywords = "Frustration, Organic superconductors, Quantum spin antiferromagnet, Triangular lattice, μSR",

author = "Saor Nakajima and Taka Suzuki and Yasuyuk Ishii and Kazuk Ohishi and Isa Watanabe and Takayuk Goto and Akir Oosawa and Naok Yoneyama and Nori Kobayashi and Pratt, {Francis L.} and Takahik Sasaki",

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AU - Nakajima, Saor

AU - Suzuki, Taka

AU - Ishii, Yasuyuk

AU - Ohishi, Kazuk

AU - Watanabe, Isa

AU - Goto, Takayuk

AU - Oosawa, Akir

AU - Yoneyama, Naok

AU - Kobayashi, Nori

AU - Pratt, Francis L.

AU - Sasaki, Takahik

PY - 2012/6

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N2 - The ground state of the quantum spin system κ-(BEDT-TTF) 2Cu 2(CN) 3, in which antiferromagnetically interacting S = 1=2 spins are located on a nearly equilateral triangular lattice, attracts considerable interest from both experimental and theoretical aspects, because a simple antiferromagnetic order may be inhibited owing to geometrical frustration, and hence, an exotic ground state is expected. Furthermore, two recent reports on the ground state of this system have increased the intrigue by showing completely controversial results: one indicates the gapless state and the other the gapped state. By utilizing the SR microscopic probe, we have investigated its spin dynamics below 0.1 K, unveiling its microscopically phase-separated ground state at zero field.

AB - The ground state of the quantum spin system κ-(BEDT-TTF) 2Cu 2(CN) 3, in which antiferromagnetically interacting S = 1=2 spins are located on a nearly equilateral triangular lattice, attracts considerable interest from both experimental and theoretical aspects, because a simple antiferromagnetic order may be inhibited owing to geometrical frustration, and hence, an exotic ground state is expected. Furthermore, two recent reports on the ground state of this system have increased the intrigue by showing completely controversial results: one indicates the gapless state and the other the gapped state. By utilizing the SR microscopic probe, we have investigated its spin dynamics below 0.1 K, unveiling its microscopically phase-separated ground state at zero field.

KW - Frustration

KW - Organic superconductors

KW - Quantum spin antiferromagnet

KW - Triangular lattice

KW - μSR

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